Furnace



Feb. 10. 1925. 1,525,500

J. w. GATES FURNACE Filed Oct. 11, 1922 .24 I 11 20 F163 INVENTOR i3 rib/921W Gvflfes Patented Feb. in, was.

PATENT OFFICE.

JOHN W. GATES, OF MONTREAL, QUEBEC, CANADA.

FURNACE.

Application filed October 11, 1922. Serial No. 593,797.

To all whom it may concern:

Be it known that 1, JOHN W. GATES, a subject of the King of Great Britain, and resident of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear, and exact description.

This invention relates to new and useful improvements in furnaces and the object of the invention is to provide a simple and eilicient feed device for pulverized fuel burning furnaces.

Another object is to provide a device for feeding pulverized fuel, in which the fuel is mixed with preheated air before being fed into the furnace.

A further object is to provide a feeding device for pulverized fuel in which the feed pipes can be used as arch supports.

In my invention, I provide a plurality of tubes for receiving the fuel and one or more pipes connected with the fuel tubes for supplying a quantity of preheated air to be mixed with the fuel. The fuel tubes are fitted with burners or nozzles at their ends adjacent the interior of the furnace. Air is blown into the fuel tubes by a fan, blower or the like. The suction caused by the passage of the air through the fuel tubes draws the fuel, which is preferably gravity fed, into the fuel tubes, and it also draws air from the heated air pipes into the fuel tubes, where q the fuel and air freely mix, the mixture being then blown into the furnace through the nozzles or burners. These tubes can be fitted into any furnace arch and they can be utilized to form the arch support.

In the drawings which illustrate the inventionz- Fig. 1 is a sectional elevation of a furnace arch showing the feeding device supporting said arch.

Fig. 2 is a plan view of the device as applied to a furnace wall.

Fig. 3 is a vertical sectional view through a furnace equipped with the invention, the latter being shown in side elevation.

Referring more particularly to the drawings, 11 designates spaced side walls of a furnace shouldered at 12 to support the ends of an arch 13 bridging the gap between the said walls and forming the top of the furnace at one side of the combustion chamber 14. Arch 1.3 is composed of a plurality of suitably formed blocks suspended from a series of spaced tubular members 15 extending between and in parallel relation to the walls 11, from a point exterior of the furnace to the combustion chamber 14. These members 15 are positioned directly below and at right angles to an upper series of tubular members 16 which have their ends supported by the walls-11 as indicated at 17, the members of the two series being connected together by hollow coupling necks 18 at their points of intersection. The exact manner of forming and suspending the blocks of arch 13 from the members 15 is described and claimed in my prior Patent 1,404,845, and forms no essential part of the present invention.

The members 16 are each closed at one end and at their opposite ends are connected to an air supply pipe 19 in order to provide for delivery of superheated air to the members 15. The air passes initially into the members 16 from pipe 19 and thence through coupling necks 18 to the members 15. Preheating of the air occurs during passage thereof through the members 16.

The inner ends of members 15 are equipped with fuel delivery nozzles 20 positioned as shown in Fig. 3 to discharge into the combustion chamber 1 1 and these nozzles are preferably enclosed by blocks 13 of the furnace arch in such manner as to prevent excessive heating thereof. The blocks 13 are preferably cut away at the tips of the nozzles to present flaring discharge orifices. The outer ends of members 15 are connected in a suitable manner to a fuel delivery pipe 21 through which pulverized or liquid fuel may be fed in any desired manner. Positioned immediately below supply pipe 21 is an air blast pipe 23 equipped with discharge nozzles 24 entering the outer ends of members 15 substantially as shown in Fig. 3.

The operation of the device is as follows:

Air delivered through pipe 23 is blown into the fuel tubes 15 through the blast nozzles 24 and the suction thus produced within said tubes serves to draw in fuel from the fuel supply pipe 21 while at the same time a supply of preheated air is caused to pass through the members 16 and coupling necks 18 to the tubes 15, the

resulting mixture of fuel and air being delivered through the nozzles 20 into the combustion chamber 14.

Having thus described my invention, what I claim is 1. The combination of a furnace including a combustion chamber and spaced side walls defining a passage communicating therewith, a combined arch support and fuel feeding device comprising a set of tubes extending longitudinally of the passage, nozzles at the inner ends of said tubes arranged to discharge into the combustion chamber, means for supplying air and fuel to the outer ends of said tubes, an upper set of tubes extending transversely of the passage andsupported by said walls, said upper tubes being closed at one end and open at the other end to provide for the entrance of air and hollow coupling necks connecting the two sets of tubes at their points of intersection.

' 2. The combination of a furnace having a combustion chamber and spaced side walls defining a passage coimnunicating with said chamber, of a combined arch support and fuel feeding device comprising a lower set of spaced tubes extending longitudinally of the passage and contained in the same horizontal plane, nozzles at the inner ends of said tubes positioned to discharge into the combustion chamber, fuel and air supply pipes connected to the outer ends of said tubes, an upper set of tubes extending transversely of said passage and supported by said walls and hollow coupling necks connecting the two sets of tubes at their points of intersection.

3. A combined arch support and fuel feeding device for furnaces, comprising longitudinal and transverse members located in different planes and of hollow formation, the members in the lower plane being suspended from and communicating with the members in the upper plane, an air supply conduit connected with the upper members at one end thereof, fuel delivery nozzles carried by the lower members at one end thereof and air and fuel supplyrpipes connected to the remaining ends of said lower members.

4. A combined furnace arch support and fuel feeding device comprising a plurality of tubular members, a second plurality of tubular members arranged at an angle to and below the first members, and tubular connections between said members where they cross one another, means for supplying fuel to certain of said members, means for supplying air to other of said members, and nozzles connected to the lower members to receive the mixture of air and fuel therefrom.

5. A combined furnace arch support and fuel feeding device, comprising a plurality of tubular members, a second plurality of tubular members arranged at an angle to and below the first members, tubular connections between said members where they cross one another, certain of said members being provided with suitable inlet and outlet openings, burner nozzles mounted in said outlet openings, and air and fuel supply conduits connected with said inlet openings.

6. A combined furnace arch'support and fuel feeding device, comprising a plurality of tubular members, second plurality of tubular members arranged at an angle to and below the first members, and tubular connections between saidv members where they cross one another, an air supply pipe connected to the members in the upper plane, a fuel supply pipe connected to the members in the lower plane, a blast pipe connected to-the members in the lower plane for initiating flow of fuel therethrough, and burner nozzles carried by said last mentioned members to receive the mixture of air and fuel.

In witness whereof, I have hereunto set my hand.

JOHN W. GATES 

